android_build/core/find-jdk-tools-jar.sh

if [[ "x$ANDROID_JAVA_HOME" != x && -e $ANDROID_JAVA_HOME/lib/tools.jar ]] ; then
    echo $ANDROID_JAVA_HOME/lib/tools.jar
else
    JAVAC=$(which javac)
    if [ -z "$JAVAC" ] ; then
	echo "Please-install-JDK-5.0,-update-12-or-higher,-which-you-can-download-from-java.sun.com"
	exit 1
    fi
    while [ -L $JAVAC ] ; do
        LSLINE=$(ls -l $JAVAC)
        JAVAC=$(echo -n $LSLINE | sed -e "s/.* -> //")
    done
    echo $JAVAC | sed -e "s:\(.*\)/bin/javac.*:\\1/lib/tools.jar:"
fi